Wrong database name in full report title fixed

Description

After dividing collecting and generating reports on separated stages, the title of full report got wrong (default) database name. In this MR it has been fixed. Added storage of database name in nodes.json, so on any stage we can use the original database name.

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes

Related issue

#469 (closed)

Examples

Before

PostgreSQL Checkup. Project: 'postila'. Database: 'postgres'

After

PostgreSQL Checkup. Project: 'postila'. Database: 'curdb'

Closes #469 (closed)